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Commitments and contingencies - Estimates of Future Commitments (Detail) $ in Thousands | Aug. 06, 2021 MWac | Mar. 03, 2022 lawsuit | Dec. 31, 2021 USD ($)
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Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | $ 327,438
Year 2 |  |  | 181,692
Year 3 |  |  | 154,481
Year 4 |  |  | 146,458
Year 5 |  |  | 102,903
Thereafter |  |  | 1,150,942
Total |  |  | 2,063,914
Power purchase |  |  |
Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | 62,759
Year 2 |  |  | 33,521
Year 3 |  |  | 33,585
Year 4 |  |  | 33,821
Year 5 |  |  | 12,274
Thereafter |  |  | 155,106
Total |  |  | 331,066
Gas supply and service agreements |  |  |
Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | 101,406
Year 2 |  |  | 75,482
Year 3 |  |  | 49,328
Year 4 |  |  | 44,286
Year 5 |  |  | 26,887
Thereafter |  |  | 176,535
Total |  |  | 473,924
Service agreements |  |  |
Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | 65,230
Year 2 |  |  | 59,641
Year 3 |  |  | 58,356
Year 4 |  |  | 54,953
Year 5 |  |  | 50,181
Thereafter |  |  | 347,546
Total |  |  | 635,907
Capital projects |  |  |
Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | 85,130
Year 2 |  |  | 0
Year 3 |  |  | 0
Year 4 |  |  | 0
Year 5 |  |  | 0
Thereafter |  |  | 0
Total |  |  | 85,130
Land easements |  |  |
Commitments Disclosure [Line Items] |  |  |
Year 1 |  |  | 12,913
Year 2 |  |  | 13,048
Year 3 |  |  | 13,212
Year 4 |  |  | 13,398
Year 5 |  |  | 13,561
Thereafter |  |  | 471,755
Total |  |  | $ 537,887
Gaia Power Inc. vs APUC | Amherst Island Wind Facility |  |  |
Commitments Disclosure [Line Items] |  |  |
Wind power capacity (megawatt AC) | MWac | 74 |  |
Gaia Power Inc. vs APUC | Blue Hill Wind Project |  |  |
Commitments Disclosure [Line Items] |  |  |
Wind power capacity (megawatt AC) | MWac | 175 |  |
Mountain View Fire | Subsequent Event |  |  |
Commitments Disclosure [Line Items] |  |  |
Number of active lawsuits | lawsuit |  | 8 |
Number of lawsuits filed by groups of individual plaintiffs | lawsuit |  | 4 |
Number of lawsuits filed by insurance companies | lawsuit |  | 3 |

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